Wall tolerance applies to ends only, end preparation per ansi b16.25
A fitting that forms an angle of less than 180 degrees (3.141 radians) from a straight flow. Both connecting ends have machine threads (straight threads other than pipe or hose series) designed to accommodate a tube or is unthreaded and designed to accommodate a tube. It may have side or heel inlet(s). See also elbow, pipe and connector, multiple, fluid pressure line.
Classification: Threaded elbows and bends of iron or steel (other than cast iron or stainless steel) for pipes and tubes
NSN 5935-01-124-4634
NSN 6105-01-477-4744
NSN 6650-00-283-0978
NSN 5895-01-168-7964
NSN 5999-01-203-2169
NSN 5965-01-131-4078
NSN 5895-01-439-2224
NSN 6150-01-278-9400
NSN 5945-01-520-4861
NSN 5990-01-387-6114
NSN 5950-01-653-1264
NSN 6110-01-004-9870